Metric

The Metric System iscommon term forInternational SystemUnits.

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In mathematics,metric (also called distance metric)an abstraction ofnotiondistance; ituseddefine metric spaces. The article on metric spaces containsdetailed discussion oftopic.

An important special case ismetric that turnsmanifold intoRiemannian manifold. Suchmetric allowsintroduce geodesics andmeasure distancesangles onmanifold.